Finding the Fourth Proportional to 3,601.72, 5,397.72 and 1,409.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,601.72 : 5,397.72 = 1,409.20 : x
2. Step 2: Convert to fraction form
   3,601.72/5,397.72 = 1,409.20/x
3. Step 3: Cross multiply
   3,601.72x = 5,397.72 × 1,409.20
4. Step 4: Simplify right side
   3,601.72x = 7,606,467.02
5. Step 5: Solve for x
   x = 7,606,467.02/3,601.72
6. Step 6: Final answer
   x = 2,111.90